Foldable step stool



FIG. 1 is a front perspective view of a foldable step stool;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is right side elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a bottom perspective view thereof.

The broken lines shown in the drawing views are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a foldable step stool, as shown and described. 